JPS5841040Y2 - Raw material supply device for roll press - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a roll press that performs compression molding by supplying powder between two closely rotating rolls arranged in parallel in the horizontal direction, and in particular, feeds raw material powder between the rolls under pressure. Pertains to raw material supply equipment.

The product that can be formed by the above-mentioned roll press is a briquetting machine. For example, when used as a briquetting machine, pockets that serve as the matrix of briquettes are formed on the outer peripheral surface of the rolls so that they can face each other between the contacting rolls. In addition, if a plate with a pattern is to be obtained, a corresponding pattern is engraved on the outer circumferential surface of the rolls spaced apart according to the plate thickness, and if a plate with a smooth surface is to be obtained, the outer circumferential surface of the roll is also etched. Made smooth.

A so-called screw feeder is used as a raw material supply device for supplying the raw material powder to such a roll press, and this screw feeder has a cylindrical supply casing in the shape of an inverted truncated cone and a screw concentrically arranged inside the cylindrical supply casing. The screw is connected to a rotational drive device.

The lower end of the feed casing is provided with an opening for the release of raw material, which discharge opening is located near the edge of the V-shaped groove formed between the rolls when the screw feeder is positioned relative to the roll press. placed close to.

Further, the lower end of the screw is positioned approximately at the same level as the discharge opening, and the supply casing extends close to the outer periphery of the screw up to the lower end of the screw, and the discharge opening is located near the outer periphery of the screw, and the discharge opening is located at the same level as the discharge opening. Covers the effective length range or slightly exceeds it.

A major drawback of such conventional raw material supply devices is that a large amount of powder is supplied to the center of the roll's effective length.

This is due to the fact that the discharge opening is circular and the friction between the supplied powder and the liner that constitutes the wall for preventing the supply powder from escaping at the end position of the effective length of the casing. This is thought to be caused by poor flow, etc. If the amount of powder supplied near both ends is smaller than at the center of the roll's effective length, excess powder may be deposited in the center. As a result, the molded product has a high density in the center and a low density at both ends, resulting in an uneven product and may cause cracks in the molded product in the center.

For example, when manufacturing briquettes, briquettes formed at both ends of the roll tend to have weaker strength and become irregular, compared to briquettes formed at the center of the roll.

In order to deal with this problem, conventionally, the lower end of the screw protrudes from the lower end of the casing and plunges into the V-shaped raw material compression groove to limit the amount of powder supplied to the center in the width direction of the roll. It has been proposed to uniformize the raw material supply over the entire effective length of the roll (for example, see Japanese Patent Publication No. 53-42474).

However, when changing the raw material powder to another one,
Alternatively, when changing the effective length of the roll, the screw or device itself must be changed to one that is compatible with the change, which requires time and effort, and requires preparing a large number of screws or devices. Because of this necessity, it is expensive and requires a large storage space.

The purpose of the present invention is to eliminate such drawbacks, and according to the present invention, the purpose is to supply powder raw material by a screw feeder between two closely rotating rolls arranged horizontally and compress it. A raw material supply device for a roll press of a forming type, the raw material supply device having an inverted truncated cone-shaped casing containing a single rotating screw for pumping the raw material, and the outlet end of the casing is located between the rolls. The casing is placed close to the roll on a raw material compression groove with a V-shaped cross section formed in the casing, and the outlet diameter of the casing covers a range of the roll effective length or a range l slightly exceeding this, and the above-mentioned A single screw has a dimension and shape close to the inner wall of the casing, and further includes a V-shaped material compression groove at the lower end of the screw that protrudes from the lower end of the casing and extends along the cross section of the groove. In the raw material supply device, a powder supply limiting member is equipped with a protruding vane to limit the amount of powder supplied to the central part in the width direction of the roll and uniformize the supply of raw material over the entire effective length of the roll. This is accomplished by removably attaching the powder supply restriction member described above to the screw.

Hereinafter, the present invention will be explained in more detail with reference to embodiments shown in the accompanying drawings.

In Figures 1 and 2, numerals 1 indicate rolls arranged close to each other and facing each other in the horizontal direction, and while these two rolls 1 are rotated in the direction of the arrow in the figures, raw material powder is supplied between them. By doing so, the powder is compression molded, resulting in a product that follows the morphology of the roll surface.

As shown in the figure, the raw material supply device 2 has a cylindrical supply casing 3 in the shape of an inverted truncated cone, and a screw 4 disposed closely concentrically within the cylindrical supply casing 3, which is connected to a drive device 5.
It is driven to rotate by.

The inner circumferential surface of the cylindrical supply casing 3 is tapered along the outer circumferential surface of the screw 4, and is disposed close to each other.

This allows the raw material to be fed efficiently.

A powder waste pile opening 6 is formed at the lower end of the supply casing 3, and the edge 7 of this discharge opening is located at the edge of a V-shaped groove 8 for compressing raw material formed between the outer peripheral surfaces of the rolls. 9 and close to both rolls, and said discharge opening 6 covers a range 1 of or slightly beyond the effective length of the rolls involved in forming.

In such a raw material supply device 2, according to the present invention, the screw 4 has a powder supply restriction member 10 that projects from the discharge opening 6 into the V-shaped groove 8, and this powder supply The restriction member restricts powder supply to the center of the roll's effective length.

That is, in the present invention, by reducing the amount of powder supplied to the center of the roll using the powder supply limiting member 10, the amount of powder supplied over the entire effective length of the roll is made uniform, thereby making the density of the molded product uniform. It is something that we are trying to change.

The powder is compressed as the roll rotates, but the powder supply restriction member 10 reduces the powder supply at the center of the roll, and prevents the propagation of the compressive force, reducing the influence of the powder supply restriction member 10. The supply amount and compressive force at both ends of the roll become the same.

As a result, the density of the molded product becomes uniform over the entire effective length of the roll.

As shown in FIGS. 4 and 5, the powder supply limiting member 10 is made removable from the screw 4 by means of a screw 12, etc., and therefore, the powder supply limiting member 10 can be removed depending on the properties of the raw material powder, the effective length of the roll, etc. The screw shape shown in Fig. 4 is applied, or the one having one or more blades 11 parallel to or at an angle to the screw axis as shown in Fig. 5, or of other dimensions and shapes. You can use things according to the situation.

Hereinafter, the case of forming soda ash powder into briquettes using an actual machine will be explained in comparison with a conventional machine.

The diameter of the roll 1 is 520w1, and the pockets, which are the matrix of the molded product, are arranged equally on the outer peripheral surface and in four rows in the axial direction of the roll.

The diameter of the discharge opening 6, which covers all four rows of pockets, is 15011 m.

In such a device, when working with the lower end of the screw 4 and the edge 7 of the discharge opening 6 at approximately the same level, strong briquettes are formed in the two rows of pockets in the center of the effective roll length. However, the two rows of briquettes on both sides became soft.

Furthermore, when the screw rotation speed was increased to increase the strength of the two rows of briquettes on both sides, excessive compressive force was applied to the two rows of briquettes in the center, causing cracks to occur inside the briquettes.

On the other hand, as shown in FIG.
As a result of extending about 5011 gN downward along the outer periphery of the roll 1 and adjusting the screw rotation speed, the strength of the briquettes became almost the same overall.

As described above, according to the present invention, the amount of powder supplied is not only uniform over the entire surface of the roller compression surface, but also when changing the raw material powder to one with other properties, or when changing the effective length of the roll. When changing, it is only necessary to replace the powder supply restriction member, and the sludge member can be produced relatively inexpensively and does not require much space to store, making it possible to form products economically. It is something.

[Brief explanation of the drawing]

FIG. 1 is a central vertical cross-sectional view showing a first embodiment of the raw material supply device for a roll press according to the present invention, FIG. 2 is a drawing similar to FIG. 1, showing a second embodiment, and FIG. 1- in Figure 2
4 is a front view showing the installation state of the screw and powder supply restricting member in the device shown in FIG. 1, and FIG. 5 is a sectional view taken along line 1, and FIG. FIG. 3 is a front view showing a state in which the body supply restriction member is attached. The correspondence relationship between the main parts shown and the symbols is as follows. 1...roll, 2...raw material supply device,
3... Supply casing, 4... Screw 8... V-shaped groove, 9... Edge of V-shaped groove, 10... ...Powder supply restriction member.

Claims (1)

[Scope of utility model registration request] A raw material supply device for a roll press in which a powder raw material is supplied by a screw feeder between two closely rotating rolls arranged horizontally and compressed, and this raw material supply device is a single unit for pumping the raw material. It has a casing in the shape of an inverted truncated cone with a built-in rotating screw, and the outlet end of this casing is placed close to the rolls on the raw material compression groove with a V-shaped cross section formed between the rolls, and the outlet diameter of the casing is is covered by the casing at or slightly beyond the effective length of the roll, and the single nozzle screw is sized and shaped close to the inner wall of the casing, and furthermore, the lower end of the screw is provided with a Protruding from the bottom end v
A blade is attached to the letter-shaped raw material compression groove along the cross section of this groove to limit the amount of powder supplied to the center in the width direction of the roll, ensuring uniform raw material supply over the entire effective length of the roll. In the raw material supply device which uses the powder supply limiting member to
A raw material supply device for a roll press, characterized in that the powder supply restriction member described above is removably attached to a screw.